Bulb



FIG. 1 is a perspective view of the bulb embodying the new design;

FIG. 2 is a front elevational view thereof, the rear elevational viewbeing identical thereto;

FIG. 3 is a right side elevational view thereof, the left sideelevational view being identical thereto;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for bulb, as shown and described.